diff options
Diffstat (limited to 'StdLib/Include/netinet/in.h')
| -rw-r--r-- | StdLib/Include/netinet/in.h | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/StdLib/Include/netinet/in.h b/StdLib/Include/netinet/in.h new file mode 100644 index 0000000000..6f13b02d3a --- /dev/null +++ b/StdLib/Include/netinet/in.h @@ -0,0 +1,557 @@ +/* $NetBSD: in.h,v 1.77 2006/11/13 05:13:41 dyoung Exp $ */
+
+/*
+ * Copyright (c) 1982, 1986, 1990, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)in.h 8.3 (Berkeley) 1/3/94
+ */
+
+/*
+ * Constants and structures defined by the internet system,
+ * Per RFC 790, September 1981, and numerous additions.
+ */
+
+#ifndef _NETINET_IN_H_
+#define _NETINET_IN_H_
+
+#include <machine/int_types.h>
+
+#ifndef uint8_t
+typedef __uint8_t uint8_t;
+#define uint8_t __uint8_t
+#endif
+
+#ifndef uint32_t
+typedef __uint32_t uint32_t;
+#define uint32_t __uint32_t
+#endif
+
+#include <sys/ansi.h>
+
+#ifndef in_addr_t
+typedef __in_addr_t in_addr_t;
+#define in_addr_t __in_addr_t
+#endif
+
+#ifndef in_port_t
+typedef __in_port_t in_port_t;
+#define in_port_t __in_port_t
+#endif
+
+#ifndef sa_family_t
+typedef __sa_family_t sa_family_t;
+#define sa_family_t __sa_family_t
+#endif
+
+/*
+ * Protocols
+ */
+#define IPPROTO_IP 0 /* dummy for IP */
+#define IPPROTO_HOPOPTS 0 /* IP6 hop-by-hop options */
+#define IPPROTO_ICMP 1 /* control message protocol */
+#define IPPROTO_IGMP 2 /* group mgmt protocol */
+#define IPPROTO_GGP 3 /* gateway^2 (deprecated) */
+#define IPPROTO_IPV4 4 /* IP header */
+#define IPPROTO_IPIP 4 /* IP inside IP */
+#define IPPROTO_TCP 6 /* tcp */
+#define IPPROTO_EGP 8 /* exterior gateway protocol */
+#define IPPROTO_PUP 12 /* pup */
+#define IPPROTO_UDP 17 /* user datagram protocol */
+#define IPPROTO_IDP 22 /* xns idp */
+#define IPPROTO_TP 29 /* tp-4 w/ class negotiation */
+#define IPPROTO_IPV6 41 /* IP6 header */
+#define IPPROTO_ROUTING 43 /* IP6 routing header */
+#define IPPROTO_FRAGMENT 44 /* IP6 fragmentation header */
+#define IPPROTO_RSVP 46 /* resource reservation */
+#define IPPROTO_GRE 47 /* GRE encaps RFC 1701 */
+#define IPPROTO_ESP 50 /* encap. security payload */
+#define IPPROTO_AH 51 /* authentication header */
+#define IPPROTO_MOBILE 55 /* IP Mobility RFC 2004 */
+#define IPPROTO_IPV6_ICMP 58 /* IPv6 ICMP */
+#define IPPROTO_ICMPV6 58 /* ICMP6 */
+#define IPPROTO_NONE 59 /* IP6 no next header */
+#define IPPROTO_DSTOPTS 60 /* IP6 destination option */
+#define IPPROTO_EON 80 /* ISO cnlp */
+#define IPPROTO_ETHERIP 97 /* Ethernet-in-IP */
+#define IPPROTO_ENCAP 98 /* encapsulation header */
+#define IPPROTO_PIM 103 /* Protocol indep. multicast */
+#define IPPROTO_IPCOMP 108 /* IP Payload Comp. Protocol */
+#define IPPROTO_VRRP 112 /* VRRP RFC 2338 */
+#define IPPROTO_CARP 112 /* Common Address Resolution Protocol */
+#define IPPROTO_RAW 255 /* raw IP packet */
+#define IPPROTO_MAX 256
+
+/* last return value of *_input(), meaning "all job for this pkt is done". */
+#define IPPROTO_DONE 257
+
+/* sysctl placeholder for (FAST_)IPSEC */
+#define CTL_IPPROTO_IPSEC 258
+
+
+/*
+ * Local port number conventions:
+ *
+ * Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
+ * unless a kernel is compiled with IPNOPRIVPORTS defined.
+ *
+ * When a user does a bind(2) or connect(2) with a port number of zero,
+ * a non-conflicting local port address is chosen.
+ *
+ * The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
+ * that is settable by sysctl(3); net.inet.ip.anonportmin and
+ * net.inet.ip.anonportmax respectively.
+ *
+ * A user may set the IPPROTO_IP option IP_PORTRANGE to change this
+ * default assignment range.
+ *
+ * The value IP_PORTRANGE_DEFAULT causes the default behavior.
+ *
+ * The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
+ * and exists only for FreeBSD compatibility purposes.
+ *
+ * The value IP_PORTRANGE_LOW changes the range to the "low" are
+ * that is (by convention) restricted to privileged processes.
+ * This convention is based on "vouchsafe" principles only.
+ * It is only secure if you trust the remote host to restrict these ports.
+ * The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
+ */
+
+#define IPPORT_RESERVED 1024
+#define IPPORT_ANONMIN 49152
+#define IPPORT_ANONMAX 65535
+#define IPPORT_RESERVEDMIN 600
+#define IPPORT_RESERVEDMAX (IPPORT_RESERVED-1)
+
+/*
+ * Internet address (a structure for historical reasons)
+ */
+struct in_addr {
+ in_addr_t s_addr;
+} __attribute__((__packed__));
+
+/*
+ * Definitions of bits in internet address integers.
+ * On subnets, the decomposition of addresses to host and net parts
+ * is done according to subnet mask, not the masks here.
+ *
+ * By byte-swapping the constants, we avoid ever having to byte-swap IP
+ * addresses inside the kernel. Unfortunately, user-level programs rely
+ * on these macros not doing byte-swapping.
+ */
+#ifdef _KERNEL
+#define __IPADDR(x) ((uint32_t) htonl((uint32_t)(x)))
+#else
+#define __IPADDR(x) ((uint32_t)(x))
+#endif
+
+#define IN_CLASSA(i) (((uint32_t)(i) & __IPADDR(0x80000000)) == \
+ __IPADDR(0x00000000))
+#define IN_CLASSA_NET __IPADDR(0xff000000)
+#define IN_CLASSA_NSHIFT 24
+#define IN_CLASSA_HOST __IPADDR(0x00ffffff)
+#define IN_CLASSA_MAX 128
+
+#define IN_CLASSB(i) (((uint32_t)(i) & __IPADDR(0xc0000000)) == \
+ __IPADDR(0x80000000))
+#define IN_CLASSB_NET __IPADDR(0xffff0000)
+#define IN_CLASSB_NSHIFT 16
+#define IN_CLASSB_HOST __IPADDR(0x0000ffff)
+#define IN_CLASSB_MAX 65536
+
+#define IN_CLASSC(i) (((uint32_t)(i) & __IPADDR(0xe0000000)) == \
+ __IPADDR(0xc0000000))
+#define IN_CLASSC_NET __IPADDR(0xffffff00)
+#define IN_CLASSC_NSHIFT 8
+#define IN_CLASSC_HOST __IPADDR(0x000000ff)
+
+#define IN_CLASSD(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
+ __IPADDR(0xe0000000))
+/* These ones aren't really net and host fields, but routing needn't know. */
+#define IN_CLASSD_NET __IPADDR(0xf0000000)
+#define IN_CLASSD_NSHIFT 28
+#define IN_CLASSD_HOST __IPADDR(0x0fffffff)
+#define IN_MULTICAST(i) IN_CLASSD(i)
+
+#define IN_EXPERIMENTAL(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
+ __IPADDR(0xf0000000))
+#define IN_BADCLASS(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
+ __IPADDR(0xf0000000))
+
+#define IN_LINKLOCAL(i) (((uint32_t)(i) & __IPADDR(0xffff0000)) == \
+ __IPADDR(0xa9fe0000))
+
+#define IN_PRIVATE(i) ((((uint32_t)(i) & __IPADDR(0xff000000)) == \
+ __IPADDR(0x0a000000)) || \
+ (((uint32_t)(i) & __IPADDR(0xfff00000)) == \
+ __IPADDR(0xac100000)) || \
+ (((uint32_t)(i) & __IPADDR(0xffff0000)) == \
+ __IPADDR(0xc0a80000)))
+
+#define IN_LOCAL_GROUP(i) (((uint32_t)(i) & __IPADDR(0xffffff00)) == \
+ __IPADDR(0xe0000000))
+
+#define IN_ANY_LOCAL(i) (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
+
+#define INADDR_ANY __IPADDR(0x00000000)
+#define INADDR_LOOPBACK __IPADDR(0x7f000001)
+#define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */
+#define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */
+
+#define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */
+#define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */
+#define INADDR_ALLRTRS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */
+#define INADDR_CARP_GROUP __IPADDR(0xe0000012) /* 224.0.0.18 */
+#define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */
+
+#define IN_LOOPBACKNET 127 /* official! */
+
+/*
+ * Socket address, internet style.
+ */
+struct sockaddr_in {
+ uint8_t sin_len;
+ sa_family_t sin_family;
+ in_port_t sin_port;
+ struct in_addr sin_addr;
+ __int8_t sin_zero[8];
+};
+
+#define INET_ADDRSTRLEN 16
+
+/*
+ * Structure used to describe IP options.
+ * Used to store options internally, to pass them to a process,
+ * or to restore options retrieved earlier.
+ * The ip_dst is used for the first-hop gateway when using a source route
+ * (this gets put into the header proper).
+ */
+struct ip_opts {
+ struct in_addr ip_dst; /* first hop, 0 w/o src rt */
+#if defined(__cplusplus)
+ __int8_t Ip_opts[40]; /* actually variable in size */
+#else
+ __int8_t ip_opts[40]; /* actually variable in size */
+#endif
+};
+
+/*
+ * Options for use with [gs]etsockopt at the IP level.
+ * First word of comment is data type; bool is stored in int.
+ */
+#define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */
+#define IP_HDRINCL 2 /* int; header is included with data */
+#define IP_TOS 3 /* int; IP type of service and preced. */
+#define IP_TTL 4 /* int; IP time to live */
+#define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */
+#define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */
+#define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */
+#define IP_RETOPTS 8 /* ip_opts; set/get IP options */
+#define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */
+#define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */
+#define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */
+#define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */
+#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */
+#define IP_PORTRANGE 19 /* int; range to use for ephemeral port */
+#define IP_RECVIF 20 /* bool; receive reception if w/dgram */
+#define IP_ERRORMTU 21 /* int; get MTU of last xmit = EMSGSIZE */
+#if 1 /*IPSEC*/
+#define IP_IPSEC_POLICY 22 /* struct; get/set security policy */
+#endif
+
+/*
+ * Defaults and limits for options
+ */
+#define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */
+#define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */
+#define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */
+
+/*
+ * Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
+ */
+struct ip_mreq {
+ struct in_addr imr_multiaddr; /* IP multicast address of group */
+ struct in_addr imr_interface; /* local IP address of interface */
+};
+
+/*
+ * Argument for IP_PORTRANGE:
+ * - which range to search when port is unspecified at bind() or connect()
+ */
+#define IP_PORTRANGE_DEFAULT 0 /* default range */
+#define IP_PORTRANGE_HIGH 1 /* same as DEFAULT (FreeBSD compat) */
+#define IP_PORTRANGE_LOW 2 /* use privileged range */
+
+#if defined(_NETBSD_SOURCE)
+/*
+ * Definitions for inet sysctl operations.
+ *
+ * Third level is protocol number.
+ * Fourth level is desired variable within that protocol.
+ */
+#define IPPROTO_MAXID (IPPROTO_AH + 1) /* don't list to IPPROTO_MAX */
+
+#define CTL_IPPROTO_NAMES { \
+ { "ip", CTLTYPE_NODE }, \
+ { "icmp", CTLTYPE_NODE }, \
+ { "igmp", CTLTYPE_NODE }, \
+ { "ggp", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { "tcp", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { "egp", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { "pup", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { "udp", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { "idp", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { "ipsec", CTLTYPE_NODE }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { 0, 0 }, \
+ { "pim", CTLTYPE_NODE }, \
+}
+
+/*
+ * Names for IP sysctl objects
+ */
+#define IPCTL_FORWARDING 1 /* act as router */
+#define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */
+#define IPCTL_DEFTTL 3 /* default TTL */
+#ifdef notyet
+#define IPCTL_DEFMTU 4 /* default MTU */
+#endif
+#define IPCTL_FORWSRCRT 5 /* forward source-routed packets */
+#define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */
+#define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */
+#define IPCTL_SUBNETSARELOCAL 8 /* treat subnets as local addresses */
+#define IPCTL_MTUDISC 9 /* allow path MTU discovery */
+#define IPCTL_ANONPORTMIN 10 /* minimum ephemeral port */
+#define IPCTL_ANONPORTMAX 11 /* maximum ephemeral port */
+#define IPCTL_MTUDISCTIMEOUT 12 /* allow path MTU discovery */
+#define IPCTL_MAXFLOWS 13 /* maximum ip flows allowed */
+#define IPCTL_HOSTZEROBROADCAST 14 /* is host zero a broadcast addr? */
+#define IPCTL_GIF_TTL 15 /* default TTL for gif encap packet */
+#define IPCTL_LOWPORTMIN 16 /* minimum reserved port */
+#define IPCTL_LOWPORTMAX 17 /* maximum reserved port */
+#define IPCTL_MAXFRAGPACKETS 18 /* max packets reassembly queue */
+#define IPCTL_GRE_TTL 19 /* default TTL for gre encap packet */
+#define IPCTL_CHECKINTERFACE 20 /* drop pkts in from 'wrong' iface */
+#define IPCTL_IFQ 21 /* ipintrq node */
+#define IPCTL_RANDOMID 22 /* use random IP ids (if configured) */
+#define IPCTL_LOOPBACKCKSUM 23 /* do IP checksum on loopback */
+#define IPCTL_STATS 24 /* IP statistics */
+#define IPCTL_MAXID 25
+
+#define IPCTL_NAMES { \
+ { 0, 0 }, \
+ { "forwarding", CTLTYPE_INT }, \
+ { "redirect", CTLTYPE_INT }, \
+ { "ttl", CTLTYPE_INT }, \
+ { "mtu", CTLTYPE_INT }, \
+ { "forwsrcrt", CTLTYPE_INT }, \
+ { "directed-broadcast", CTLTYPE_INT }, \
+ { "allowsrcrt", CTLTYPE_INT }, \
+ { "subnetsarelocal", CTLTYPE_INT }, \
+ { "mtudisc", CTLTYPE_INT }, \
+ { "anonportmin", CTLTYPE_INT }, \
+ { "anonportmax", CTLTYPE_INT }, \
+ { "mtudisctimeout", CTLTYPE_INT }, \
+ { "maxflows", CTLTYPE_INT }, \
+ { "hostzerobroadcast", CTLTYPE_INT }, \
+ { "gifttl", CTLTYPE_INT }, \
+ { "lowportmin", CTLTYPE_INT }, \
+ { "lowportmax", CTLTYPE_INT }, \
+ { "maxfragpackets", CTLTYPE_INT }, \
+ { "grettl", CTLTYPE_INT }, \
+ { "checkinterface", CTLTYPE_INT }, \
+ { "ifq", CTLTYPE_NODE }, \
+ { "random_id", CTLTYPE_INT }, \
+ { "do_loopback_cksum", CTLTYPE_INT }, \
+ { "stats", CTLTYPE_STRUCT }, \
+}
+#endif /* _NETBSD_SOURCE */
+
+/* INET6 stuff */
+#define __KAME_NETINET_IN_H_INCLUDED_
+#include <netinet6/in6.h>
+#undef __KAME_NETINET_IN_H_INCLUDED_
+
+#ifdef _KERNEL
+/*
+ * in_cksum_phdr:
+ *
+ * Compute significant parts of the IPv4 checksum pseudo-header
+ * for use in a delayed TCP/UDP checksum calculation.
+ *
+ * Args:
+ *
+ * src Source IP address
+ * dst Destination IP address
+ * lenproto htons(proto-hdr-len + proto-number)
+ */
+static __inline u_int16_t __attribute__((__unused__))
+in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto)
+{
+ u_int32_t sum;
+
+ sum = lenproto +
+ (u_int16_t)(src >> 16) +
+ (u_int16_t)(src /*& 0xffff*/) +
+ (u_int16_t)(dst >> 16) +
+ (u_int16_t)(dst /*& 0xffff*/);
+
+ sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
+
+ if (sum > 0xffff)
+ sum -= 0xffff;
+
+ return (sum);
+}
+
+/*
+ * in_cksum_addword:
+ *
+ * Add the two 16-bit network-order values, carry, and return.
+ */
+static __inline u_int16_t __attribute__((__unused__))
+in_cksum_addword(u_int16_t a, u_int16_t b)
+{
+ u_int32_t sum = a + b;
+
+ if (sum > 0xffff)
+ sum -= 0xffff;
+
+ return (sum);
+}
+
+extern struct in_addr zeroin_addr;
+extern u_char ip_protox[];
+
+int in_broadcast(struct in_addr, struct ifnet *);
+int in_canforward(struct in_addr);
+int in_cksum(struct mbuf *, int);
+int in4_cksum(struct mbuf *, u_int8_t, int, int);
+void in_delayed_cksum(struct mbuf *);
+int in_localaddr(struct in_addr);
+void in_socktrim(struct sockaddr_in *);
+
+#define in_hosteq(s,t) ((s).s_addr == (t).s_addr)
+#define in_nullhost(x) ((x).s_addr == INADDR_ANY)
+
+#define satosin(sa) ((struct sockaddr_in *)(sa))
+#define sintosa(sin) ((struct sockaddr *)(sin))
+#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
+#endif /* _KERNEL */
+
+#endif /* !_NETINET_IN_H_ */
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